Calculating machine



F. A. HART CALCULATING MACHINE Feb. 12 1924.

Filed June 27, 1922 2 Sheets-Sheet 1 Samoan oz :Z/AL

I @51 LL. flficvneq Feb 12 1924. 1,483,580

F. A. HART CALCULAT ING MACHINE Filed June 2'7. 1922 2 Sheets-Sheet 2 Patented Feb. 12, 1924.

UNITED STATES FREDERICK A. HART, OF COUNTING MACHINE YORK.

PATENT OFFICE.

TO REMINGTON AC- CALCULATING MACHINE.

Application filed June 2'7, 1922. Serial No. 571,204.

To-(ll/ (I /10m. 2'! may concern.

lie it known that I,'l m-:nmncit A. HART, a citizen of the l nitcd States, and resident of New llritain, in the county of Hartford and State of onnecticut, have invented certain new and useful Improvements in (':-ilculating Machines, of which the following is a specification.

My invention relates to calculatin machines and it. has for its principal ob ect to provide improved clearance proof mechanism for such machines.

To the above and other ends my invention consists in certain features of construction and combinations and arrangements of parts all of which will be fully set forth herein and particularly pointed out in the claims.

()no fornrof my invention is illustrated in the accompanyingdrawings, in which- Figure 1 is a fragmentary front View of a portion of a combined typewriting and calculating, machine having my invention embodied therein.

Figure 2 is a side elevation, partly in section and with parts broken away.

Figure 3 is a top plan view. 7

Figure 4 is an isometric view-of a frame piece or bracket. D

Figure 5 is an isometric view of a part of the mechanism.

Figure (3 is an enlarged view showing a locking tooth and notch.

I have shown my invention calculating machine which, except for the features hereinafter described in detail, may be identical with that shown and described in the patent to John C. VVahl, No. 1,270,- 471, dated June 25, 1918. As said machine is well known in the art and is fully described in said patent, I have in the drawings illustrated only so much thereof-m ls essential to an understanding of my invention in its applicationthereto.

The said machine comprises numeral keys 8, types 9 and platen 10, as indicated conventionally in Fig. 1. Said platen is mounted in a carriage of the ordinary sort which is connected by means of certain arms with a calculator carriage or truck 11, F ig. 2, which truck is partly supported by the said typewriter 1arriage and partly by certain rollers, which rollers are journaled in a sta tionary frame-piece 12 constituting the prinof the segment 22.

applied to av Remi ngton-lVal1l combined typewriting and cipal part of the main frame of the Wahl calculating mechanism. The stationary framework of said mechanism also includes eertain fore and aft extending frame plates 18.

Any desired number of column totalizers 14 can be mounted on the truck 11 so that inthe use of the machine they will travel back and forth across the master wheel 15 secured to shaft 16 which shaft is journaled in the frame plates 13. Said master wheel shaft has a drive pinion 1.7 mounted thereon and splined thereto at 18 through the hub of the master wheel; and a second pinion 20 mounted on a non-rotating counter-shaft 21 meshes with the pinion 17. The shaft 21 is slidably supported in the frame plates 13 and the pinion 17 is held in proper position on said shaft by right and left contiguous collars 19 on the shaft. The numeral keys 8 of the typewriter are adapted to opererate certain ditferental mechanism including a gear segment 22 which in Fig. l is diagrammatically shown in the position it occupies during the down stroke of a numeral key Where it is in engagement with the pinion 20, the parts of the reversing mechanism being here shown set for subtraction; but they can be set for addition by sliding the shaft 21 and pinion 20 toward the left out of range Thehub of the pinion 17 has an annular groove 23, which is engaged by a lever of the first order (not shown), and said lever is also articulated with the shaft 21 so that when the pinion 20 is moved toward the left, the pinion l'lwill be moved toward the right into range of the segment 22, whereupon the machine will be set for addition. \Vhen the parts occupy a position half-way between the two extreme positions described, both pinions are out of range of the segment and the master wheel 15 is disconnected from the keys and will not be operated.

The shaft 21 can be slid to its three positions by a variety of means fully described in the patent above cited, and which means includes an arm 24 pivoted at 25 to said shaft 21, said arm rigidly mounted on a rock shaft 26 extending toward the rear of the machine andhat'ing on its rear end an arm 27. Said arm 27 has a pin 28 projecting into a cam slot 30 in the lower end of a floating lever 31, the middle of which is pivoted at 32 to a slide bar 33. At its upper end said lever is pivoted at 34 to a link 35. The construction is such that when the lever 31 is swung in a right and left-hand direction by a motion of either the bar 33 or link 35, the cam slot 30 acting on the pin 28 will rock the devices 27. 26, at and move the shaft 21 to its several positions. In the drawing the parts are shown in position for subtrac tion.

The mechanism inside of the totalizer liincludes a series of carrying wheels 36 which, as the totalizer travels step by step, are adapted to mesh one at a time with the master wheel 15; a series of idler pinions 37 and a series of pinions 38 one on each nu- -moral disk 40 which mnneral disks can be read through a sight opcningl in the easing of the totalizer. In operation, the reversing mechanism is set for addition while adding up a column of numbers, and for subtraction when copying the total onto the paper. The total is written by the keys the same as other numbers, and when it is written the totalizer willbe cleared provided the operator copies the total correctly.

In order to test whether or not the t0talizer is clear, that is to say, whether its wheels all stand at zero, the following mechanism has been provided. Each pinion 38 has one short teeth 42. A comb 43 is arranged transversely of the whole series of numeral wheels and has a series of thin teeth or feelers, one in the plane of each of the pin ions 38, said comb having at its ends trun nions or pivots at which are seated in bearings in the side plates of the totalizer. The short teeth 42 are so situated that when all of .the wheels stand at zero said short teeth are lined up with the comb 4.3 so that said comb can rock toward the front of the ma chine to the position shown in Fig. 2; butit any wheel does not stand at Zero its piir ion will present a long tooth to the comb 4 3 which will force said comb to occupy a position rearward of that shown in Fig. 2. This clearance-testing comb has secured to the right-hand end thereof an arm 45 having on its end a tooth that engages a notch in "the end of an arm 4-6 which is pivoted at 47 and is drawn upward by a spring 48, which spring tends to press the comb 43 against the pinions 38. The arm 45 is secured to the comb by fitting over,the righthand trunnion 44 and by being pinned at to the. right-hand extreme tooth of the comb hearnr'tti is one arm of a bell crank having also an upstanding arm 50 projecting through a slot in the top plate of the totalizer. The construction is such that. whenever the totalizer is clear the arm 5) occupies the rear position shown in full lines in Fig. 2 and when the total zer is not clear it occupies the forward position shown by dotted lines in Fig. 2. This testing or feeler construction is substantially identical with that shown and described in the application of Arthur F. Poole filed April 19, W21, Sr. No. 462,628.

I provide means which under certain conditions cooperate with the arm 50 to lock an essential part of the machine in case the totalizer is not clear but to leave it unlocked in also the totalizcr is clear. I find it convenient to lock the totalizer, and with it the carriage. against further travel in case the totalizer is'not cla rcd when it should be. The mechanism for this purpose mounted on a bracket shown in Fig. l. said bracket comprising a base part 51 secured at by screws to the upper edge of the main frame bar 12 of the calculating mechanism. At its forward edge the base plate 51 has an upright section 53 bent upward therefrom and the sheet metal is again bent forward to form a horizontal shelf 54. The base 51 and upright part 50 are cut away in the middle at to leave an opening which is occupied by the upstanding lug or bracket of the lVahl frame. on which bracket is mounted one of the rollers which support the truck 11. The upright parts 53 have their ends bent rearward to form brackets 56 in which at 57 are pivoted the arms 5S'o'f a bail or yoke 60 which bail or yoke also comprises a cross bar 59. The arms extend forwardly and the bar 59 overhangs the path of the totalizers 1,4. Said bail is drawn downward by a spring 61 and its downward motion is limited by a pin 62 projecting from one of the arms 58 over the horizontal shelf 54. In Figs. 1 and 2 the bail is held in its upper position by means presently to be described.

The bail 60 has mounted therein a piece of sheet metal 63 bent into a channel form having two depending flanges 6t and 65. the former just back of the piece 60 to which it is secured by screws 66. The rear flange 65 extends just above the path of the arm 50 when the latter is in its rear position indicating that the totalizer is clear; but when said arm 50 is in its forward, non-clear position, it is in front of said flange 65.

Beneath and co-operating with the flange 64 is a tooth 67 projecting upward from a bar 68 lying along the top of the totalizer 14 and to which it is secured by screws 70. Said flange 64 has at each end for co-operation with the tooth 67-an incline 71 asshown in Figs. 1 and 5 and intermediate the ends of said flange the latter is formed with a notch 72. The construction is such that if the yoke 60 is in its lower position with the pin 62 resting on the shelf 54 when the totalizer 14 in its travel toward the left comes into the range of said yoke. the tooth G7 engaging the incline 71 will raise the yoke to the position shown in Figs. 1 and 2, saidtooth 67 sliding along under the flange 64 as the carriage travels toward the left. The parts are shown in Fig. 1

lug 74. Fig.

in the position they occupy when the master wheel 15 is in engagement with the carrying gear 36 of lowest order. \Vhen a key is struckin this position the farriage will move one step to the left which will bring tooth 67 under notch 72 so that said tooth is no longer holding the yoke frame up and if there is nothing else to prevent said yoke will drop down and lock the carriage against further travel by the engagement of the tooth 67 in the notch 72. v if the totalizer stands at zero at the time this locking will be prevented by the arm which at that time and under those conditions will occupy its rear position shown in Fig. 2. where it rides under a 5, pro ecting slightly downward.

from the flange 65 and having inclined ends 75 as shown. This lug comes to the arm 50 during that step of the carriage next following the Fig. 1 position. It the last key depression brings the totalizer to zero, arm 50 will be 'in its rear position when it reaches the lug 74. and said arm moving under said lug will prevent the yoke from dropping down to locking posilt-will be seen that the combination which follows the operation of the last key in the adding column bar 64 will act: as a latch which drops into engagement with the tooth 67 on the totalizer so that thecarriage will become automatically locked 1f the totallzer does not stand at zero and will not become locked it the totalizer does stand at zero. This clearance proof lock can be released by raising the yoke 60 by hand. The typewriter carriage sometimes passes the locking point by a continuous movement, as when it is being drawn back to the right to begin a new line and when it; is being moved to the left by hand or by use of the tabulator. Under these conditions thedatch bar does not drop into looking engagement with the tooth 67. .As

shown in Fig. 6, which is an enlarged sectional view oi said tooth and bar, the lower part-oi the notch 72 has inclined side walls 69. \Vhen the notch 72 is passing the tooth with any motion other than a very slow one. the bar 64rhas time to drop only a little, and the incline 69 strikes a corner of the tooth 67 and cams the bar 64 up,

allowing said bar to continue its travel without looking or arresting any part.

- \Vith the mechanism as above described the carriage would be locked up every time a. number was added 'or subtracted in the totalizer 14, except in that one operationwhich brought the totalizer tozero. This 1s not what is desired and means. are provided wherebythe locking mechanism will be held out of operation under ordinary conditlons and will notusuall .come into operation' except when it is desired to clear llowevmg.

the present instance I have provided means to hold the lock out ot action whenever themachine is set for addition and to allow it to act whenever the machine is set for subtraction. It happens that these column t'otalizers that are mounted on the main truck of the machine are not tretpicntly employed ior subtracting purposes except to subtract out the total in the act. of copy ing it. In case it is required to subtract some number which is not designed to bring the totalizer to zero the lock will act but the inconvenience caused thereby will be slight as it is merely necessary to raise the yoke (it) by hand to unlock tbe'maohine.

In order to hold the lock out of action except when the totalizer is set for subtraction I have prolonged thi arm 27' as shown in Fig. l and mounted on its free end a pin 76, which pin passes loosely into a slot 77 in. a vertical bar 78, the upper portion of which is guided in the base plate 51 of my attachment. The spring 80 connects the pin 76 with another pin 81 on the bar 78, the tension of said spring holding said bar as high as the pin 76 and slot 77 will allow it to go; but the construction is such that said pin 76 can move upward independently of'the bar 78 it the latter is held down. At its upper end, said bar 78 cooperates with an arm or tooth 82 projecting downward from one of the arms 58 of the yoke 60. 'lhe'construction is such that when the arm 27 is in either'its position for addition or its position for disconnect the bar 78 stands up in rear of the arm 82 (as indicated by dotted lines inFig. 2) and holds the yoke 60 in its upper position, but when said arm 27 is in its lowest posit on, which sets the mechanism for subtI'tlCtlOlL the bar 78 stands below the arm 82 as shown by full hues in-Fig. 2 and allows the locking mechanism to operate; it the reversing mechanism is shift ed from' aga'in set for subtraction.

til such time as the reversing-mechanism is As the mechanism which I have described hides the ordinary scale plate of the Vahl v totalizer I have put graduations'84 on the front edge of the bar 68 and have formed the.cl owa l'j-. edgev of the yoke piece 60 a.

pointer 85 cooperating with said graduations.

Various changes can be made in the de tails of construction and arrangement with' out departing from m invention.

What I claim as new and desire to secure by Letters Patent, is

1. In a calculating machine. the combination with calculating mechanism including a totalizer. keys. means controlled by said keys for operating said totalizer in one denomination at a time. and step-by-step traveling means whereby the keys can operate one denomination of said totalizc' after another. of a latch adapted to move into engagement with a cooperating part to lock said traveling means. and means controlled by the state of said totalizer tor controlling the movement of said latch.

In a calculating machine, the combination with a carriage, a totalizer, keys, and means controlled by said keys and carriage for operating'said totalizer in one denom ination after another, of a latch adapted to move into engagement with a co-operating part to lock the carriage, and means controlled by the state of the totalizer for controlling the movement of said latch.

In a calculating machine, the combination with a carriage, a totalizer, keys, means controlled by said keys and carriage for operating said tota-lizer in one denomination after another, and means for reversing said operating means, of a latch adapted to move into engagement with a co-operating part to lock the carriage; and means, controlled by the state of the totalizer and by said reversing means, for controlling the movement of said latch.

4. In a calculating machine, the combination with a traveling totalizer and means for operating the same, of a latch adapted to move into engagement with a co-operating part to lock said'totalizer against further travel, and a device in said totalizer and controlled by the state of said totalizer for controlling the movement of said latch.

5. In a calculating machine, the combination with a carriage, a totalizer, and means for operating said totalizer. of two co-opcrating parts, namely, a tooth and a notched bar, adapted to come into engagement at a certain position of said carriage to lock said carriage against further travel. and a device controlled by the state of the totalizer for holding said parts out of engagement.

6. In a calcrlating machine, the combination with a carriage, and a totalizer traveling with said carriage, of a tooth traveling with said totalizer, a bar having a notch adapted to drop into engagement with said tooth to lock the carriage, and a device controlled by the state of the totalizer and adapted to move into position to prevent the drop ping of said bar,

7. In a calculating and writing machine, the combination with a carriage, a totalizer, keys. and means controlled thereby for writing the digits of a number one by one and actuating said totalizer in accordance with said digits, and means for setting said actuating means to add said digits and for setting said actuating means to subtract the total from said totalizer by the act of writing said total by said key-controlled means, of means for locking an essential part of the machine in case a total is not copied correctly, and means whereby the effectiveness of said locking means is controlled by said add and subtract setting means.

8. In a calculating machine. the combination of a totalizer, keys and connections for adding numbers in said totalizer and for subtracting out the total, reversing means for causing said connections either to add or subtract, a clearance proof lock, and means controlled by said reversing means for bolding said lock out of action when the connections are set for addition.

9. In a calculating machine, the combination of a traveling totalizer having a tooth thereon, a latching bar arranged parallel with the travel of said totalizer and having inclines whereby said tooth can raise said bar and having a notch whereby said bar can lock said tooth and totalizer, a clearance testing device, an arm movable to two positions under the control of said testing device, and a lug for said latching bar adapted to ride on said arm when the latter is in the position indicating that the totalizer is clear and thus to prevent the locking of said totalizcr.

10. In a calculatingmachine, the combination of a traveling totalizer having a tooth thereon, a latching bar arranged parallel with the tavel of said totalizer and having inclines whereby said tooth can raise said bar and having a notch whereby said bar can lock said tooth and totalizer, a clearance testing device, an arm movable to two post ions under the control of said testing device, a lug for said latching bar adapted to bear on said arm when the latter is in the position indicating that the totalizer is clea and thus to prevent the locking of said totalizer, operating mechanism for said totalizer including add and subtract setting means, and means controlled by said setting means in one setting thereof to prevent action of said latch bar.

11. In a calculating machine, the combination of a totalizer, actuating means therefor, the totalizer and its actuating means being relatively movable step-by-step, a clearance testing device associated with said totalizcr. and menus exterior to the totalizer and controlled by said testing device for locking the step-by-step moving member in case all the totalizer wheels should not be returned to zero in an operation to clear the totalizer.

12. In a calculating machine, the combination of a totalizer and actuating means therefor relatively movable step-by-step, a bail having a notch therein adapted to move into locking engagement with the step-bystep movable part and said bail having an arm, reversing mechanism for said actuating means, and a locking bolt movable by said reversing mechanism into position to block said arm to hold said bail out of looking position when said reversing mechanism is inone of its positions.

5 13. In a calculating machine, the combination of a totalizer and actuating means therefor relatively movable step-bv-step, a bail having a notch therein adapted to move into locking engagement with the step-by-step movable part and said bail having an arm, reversing mechanism for said actuating means, and a locking bolt movable by said reversing mechanism into position to block said arm to hold said bail out of locking position when said reversing mechanism in one of its positions, said bolt being spring operated so that, if the mechanism is reversed while said bail is in lockin position, said bolt will snap into its b ocking position the first time said bail is moved to unlocking position;

14. In a calculating machine, the combination with a carriage, a totalizer and means for operating said totalizer, of two e'o open- I ating parts, namely, a tooth and a notched bar, adapted to come into engagement at a certain position of said carriage to lock said carriage against further travel. and a device controlled by the state of the totaliz r for holding said parts out of engagement, said tooth and notch having aportion of the engaging surfaces inclined so as to allow said carriage to have a continuous motion past said locking position without being arrested.

Signed at the borough of Manhattan. city of New York in the county of New York and State of New York, this 26th day of June, A. I). 1922.

FREDERICK A. HART.

Witnesses:

CHARLES E. SMITH, LILLLAN Nansen. 

